Crash barrier



FIG. 1 is a top, side perspective view of a crash barrier, showing my new design; the other side being a mirror image thereof;

FIG. 2 is a bottom, side perspective view thereof; and,

FIG. 3 is an end elevational view, the other end being a mirror image thereof.

The broken line showing in FIG. 3 is for illustration purposes only and forms no part of the claimed design. 

The ornamental design for a crash barrier, as shown and described. 